Carbocyanine filter dyes and sensitizers for silver halide emulsions



United States Patent ABSTRACT THE DISCLOSURE New tricarbocyanine dyes derived from enamine and enaminium salts are useful as filter dyes and spectral sensitizers for photographic silver halide emulsions. They sensitize such emulsions over a wavelength range of about from 660 to 850 mi, and higher in some instances, with maximum sensitivity ranging about from 750 to 800 m This invention relates to photographic materials, and more particularly to a new class of'tricarbocyanine dyes 3,482,978 Patented Dec. 9, 1969 ice . 2 aggregate so strongly that no trace of the molecular absorption band can be seen. Accordingly, the new tricarbocyanine dyes of the invention are eminentlysuited for usein red and infrared photographic applications.

. It is, therefore, an object of the invention to provide a new class of tricarbocyanine dyes derived from certain enamine and enaminium salts that are useful filter dyes and sensitizers for photographic silver halide emulsions in the red to infrared region of the spectrum.

Another object is to provide novel .photographric silver halide emulsions containing therein at least one of the new dyes of the invention, and novel photographic elements prepared therewith.

Another object is to provide novel filter layers com prising a suitable hydrophilic colloid and at least one of the new dyes of the invention.

,A further object is to provide means for preparing the new dyesand novel photographic materials of the inven: tion.

Other objects will become evident from a consideration of the general description and the appended claims.

The new class of tricarbocyanine dyes of the invention are represented by the following general formula:

derived from enamine'and enaminium salts, to filter layers and light-sensitive silver halide emulsions and elements prepared therewith, and to the preparation of these dyes and photographic materials.

I It is 'well known that carbocyanine dyes containing an amino group substituent on the meso carbon atom are useful filter dyes and spectral sensitizers for photographic silver halide emulsions. For example, in Kendall et al., U.S. Patent No. 2,705,234, issued Mar. 29', 1955, and in Brooker et al., U.S. Patent No. 2,735,770, issued Feb. 1, 1956, a number of carbocyanine dyes of the above type are described and shown to extend the sensitivity of ordinary silver halide emulsions up to a range of about from 530 to 685, m This sensitivity range is satisfactory for some photographic uses, but insufficient for other uses such as for red and infrared photographic applications. It would, therefore, be highly desirable to provide carbocyanine dyes which would sensitize silver halide emulsions to longer wavelength radiations, for example, substantially above 700 m We have now made the remarkable discovery that tri- 7 an aralkyl group such as benzyl, phenylethyl, etc., an

carbocyanine dyes derived from certain enamine and enaminium salts are outstanding filter dyes and spectral sensitizers for photographic silver halide emulsions. They sensitize such emulsions over a wavelength range of about from 660 to 850 m and even higher in some instances, with maximum sensitivity ranging about from 750 to 800 m An unexpected feature is that many of the dyes of the invention further show an unusually strong tendency to form so-called J-aggregates. This is particularly true when the groups attached to nitrogen of the heterocyclic rings are sulfoalkyl groups (Example 3 hereinafter). Thus, in water solutions, the dyes aggregate and show increased maximum absorption at wavelengths ranging about from 950 to 1090 m To our knowledge, the strongly aggregating dyes of the invention are the first J-aggregating tricarbocyanines to be reported. A number of them I- aryl group (including substituted aryl) such as phenyl, tolyl, chlorophenyl, sulfophenyl, carboxyphenyl, etc., R and R each represents an ,alkyl group of from 1 to 12 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, hexyl, octyl, dodecyl, etc., an alkoxycarbonylalkyl group such as methoxycarbonylmethyl, ethoxycarbonylmethyl, ethoxycarbonylethyl, etc., an aryl group (including substituted aryl) such as phenyl, mor p-tolyl, mor p-chlorophenyl, mor p-alkoxyphenyl wherein said alkoxy group contains from 1 to 4. carbon atoms, such'as m-methoxyphenyl, m-ethoxyphenyl, m-propoxyphenyl, m-butoxyphenyl, p-methoxyphenyl, p-ethoxyphenyl, p-propoxyphenyl, p-butoxyphenyl, etc., R and R each represents a hydrogen atom, an alkyl group of from 1 to 4 carbon atoms, e.g., methyl, ethyl, propyl, isopropyl or butyl, a halogen atom, e.g., chlorine, or bromine, an alkoxy group of from 1 to 4 carbon atoms, e.g., methoxy, ethoxy, propoxy, isopropoxy, butoxy, X represents an acid anion, e.g., chloride, bromide, iodide, thiocyanate, sulfamate, perchlorate, p-toluenesulfonate, methyl sulfate, ethyl sulfate, etc., m represents a positive integer of from 1 to 2 such that when m is 1 the symbol R stands for a carboxyalkyl or a sulfoalkyl radical, and Z represents the non-metallic atoms required to complete the same 5- to 6-membered heterocyclic nuof a' thiazole nucleus (e.g., thiazole, t-methylthiazole,

4-phenylthiazole, S-methylthiazole, 5-phenylthiazole, 4,5- dimethylthiazole, 4,5-diphenylthiazole, 4-(2-thienylthiazole, etc.), a benzothiazole nucleus, (e'.g., benzothiazole', 4-chlorobenzothiazole, 5-chlorobenzothiazole, fi-chlorobenzothiazole, 7-chlorobenzothiazole, 4-methylbenzothiazole, 5 methylbenzothiazole, 6 methylbenzothiazole, S-bromoberizothiazole, fi-bromobenzothiazole, 4-phenyl benzothiazole, 5-phenylbenzothiazole, 4-methoxybenz'0 thiazole, S-methoxybenzothiazole, 6-methoxybenzothiazole, 5-iodobenzothiazole, 6-iodobenzothiazole, 4-eth0xybenzothiazole, S-ethoxybenzothiazole, tetrahydrobenzothiazole, 5,6-dimethoxybenzothiazole, 5,6 dioxymethylenebenzothiazole, 5 hydroxybenzothiazole, 6 hydroxybenzothiazole, etc.), a naphthothiazole nucleus," (e.g., a naphthothiazole, ,3 naphthothiazole, 5 methoxy B, p-naphthothiazole, 5 ethoxy ,6 naphthothiazole, 8-methoxy a naphthothiazole, 7 methoxy u naphtha thiazole, etc.), a thionaphtheno-7',6',4,5-thiazole nucleus (elg., 4 methoxythianaphtheno 7',6,4,5 thiazole, etc.), an oxazole nucleus (e.g., 4-methyloxazole, S-methyloxazole, 4-phenyloxazole, 4,5-diphenyloxazole, 4-ethy1- I oxazole, 4,5-dimethyloxazole, 5-phenyloxazole, etc.), a benzoxazole nucleus (e.g., benzoxazole, S-chlorobenzoxazole, 5 methylbenzoxazole, 5 phenylbenzoxazole, 6-methylbenzoxazole, 5,6-dimethylbenzoxazole, 4,6-dimethylbenzoxazole, S-methoxybenzoxazole, S-ethoxybenzoxazole, 5 chlorobenzoxazole, 6 methoxybenzoxazole, 5 hydroxybenzoxazole, 6 hydroxybenzoxazole, etc.) a naphthoxazole nucleus (e.g., a-naphthoxazole, fl-naphthoxazole, etc.), a selenazole nucleus (e.g., 4-methylselenazole, 4-phenylselenazole, etc.), a benzoselenazole nucleus (e.g., benzoselenazole, S-chlorobenzoselenazole, 5 methoxybenzoselenazole, 5 hydroxybenzoselenazole, tetrahydrobenzoselenazole, etc.), a naphthoselenazole nucleus (e.g., a-naphthoselenazole, fi-naphthoselenazole, etc.), a thiazoline nucleus (e.g., thiazoline, 4-methylthiazoline, etc.), a 2-pyridine nucleus (e.g., 2-pyridine, 5-methy1-2-pyridine, etc.), a 4-pyridine nucleus (e.g., 4-pyridine, 3-methyl-4-pyridine, etc.), a 2-quinoline nucleus (e.g., Z-quinoline, 3-methyl-2-quinoline, S-ethyl- Z-quinoline, 6-chloro-2-quinoline, 8-chloro-2-quinoline, -6-methoxy-2-quinoline, 8-ethoxy-2-quinoline, 8-hydroxy- Z-quinoline, etc.), a 4-quinoline nucleus (e.g., 4-quinoline, 6-methoxy-4-quinoline, 7-methyl-4-quinoline, 8-chloro-4-quinoline, etc.), a l-isoquinoline nucleus (e.g,, l-isoquinoline, 3,4-dihydro- 1 -isoquinoline, etc.), a 3-isoquinoline nucleus (e.g., 3-isoquinoline, etc.), a 3,3-dialkylindolenine nucleus (e.g., 3,3-dimethylindolenine, 5- or 6-nitro-3,3-dimethylor 5 or 6-cyano-3,3-dimethylindolenines 3,3,5 -trimethylindolenine, 3,3,7-trimethylindolenine, etc.), an imidazole nucleus (e.g., imidazole l-alkylimidazole, l-alkyl-4-phenylimidazole, 1-alkyl-4,5 -dimethylimidazole, etc.), a benzimidazole nucleus (e.g., benzimidazole, l-alkylbenzimidazole, 1-aryl-5,6-dichlorobenzimidazole, etc.), a naphthimidazole nucleus (e.g., l-alkyl- -naphthimidazole, 1-ary1-B-naphthimidazole, l-alkyl-S- methoxy-a-naphthimidazole, etc.), etc. It will be understood that the above general formula includes the quaternary salts as well as their betaine forms.

Thetricarbocyanine dyes of the invention can be conveniently prepared by condensing a nitrogen heterocyclic compound of the general formula:

R 1' =o11 orr ,=c A X)m t wherein m, n, R, X and Z are as previously defined, and R represents a methyl group or the group wherein R represents a hydrogen atom or an acyl group, e.g., acetyl, propionyl, benzoyl, etc. and R represents an aryl group, e.g., phenyl, tolyl, etc., with an appropriate enamine or enaminium salt selected from those represented by thefollowing general formulas:

wherein R R R R and X are as previously defined. The intermediate enamine and enaminium salts represented by above Formulas III, IV, V and VI are derived in general as described hereinatfer from (1) cyclopen- -tanone and its substitution products and (2) weakly basic amines, i.e., amines having a pK of less than about 7, such as for example N-methylaniline, diphenylamine, diethyliminodiacetate, etc. The heterocyclic intermediates represented by above Formula II are all well-known substances, and methods for preparing these compounds are Y well known to the art.

Advantageously, the condensation reactions for preparing the dyes of the invention are carried out in an inert solvent medium such as N-N-dimethylacetamide, a

7 lower alkanol such as ethanol, etc., and in the presence of an acetylating agent such as acetic anhydride if desired, and a basic condensing agent such as a trialkylamine, e.g., triethylamine, tripropylamine, triisopropylamine, etc., N,N-dialkylanilines such as N,N-dimethylaniline,

etc., N-alkyl-piperidines such as N-methylpiperidine, etc.,

enamine or enaminium salt of above Formulas III, IV,

1 1-di(ethoxycarbonylmethyDamino-3,3'-diethyl-10,12- ethylenethiatricarbocyanine iodide N(CH;COOC2H5)2 l-di(ethoxycarbonylmethyl)aminocyclopentene (1.3 g., 1 11101.), Z-(Z-acetanilidovinyl)-3-ethylbenzothiazolium iodide (5.0 g., 2 moIs.+%)and triethylamine (0.8 g., 1': rnol.+50%)- were dissolved in ethanol (30 ml'.) and heated under reflux for min. After cooling at room temperature for5 min., the crude dye was collected ona filter and-washed with methanol. After two recrystallizations from methanol, the yield of purified dye was 0.7 g. (18%), M.P. 198- 199 C. with-decomposition.

EXAMPLE 2 1 -1"-di(ethoxycarbonylmethyl)amino .3,'3'-diethyl-l0,12

ethylene-4,5; 4',5'-dibenbothiatricarbocyanine p-toluenesulfonate 1 i '2 KZ-aniIinoyinyD-I ethylnaphtho[l,2-d]thiazoliurn ptoluenesulfonate (11.0 g., 2 moIs.+10%) ethanol '50 ml.,

and acetic anhydride (2:1 m1., 2 moIs.+10%) were warmed together and then triethylamine (5.0 ml., 3 mols. 41-20% and l-di(ethoxyca rbonyl)aminocyclopentene (2.6 g., 1 mol.) were' added. The mixture was heated under reflux for, 10 min. After chilling, the crude'product was collected on a filter, -washed with ethanol and dried. After two recrystallizations from m-cresol/methanol, the yield of purified dye was 3.0 g."(33%), M.P. 221222 C; withdecomposition. I

EXAMPLE 3 Anhydro-l l-diphenylamino 10,12-ethylene 3,3-di(3- sulfopropyl) 4,5; 4,5 dibenzothiatricarbocyanine hydroxide, triethylamine salt N S I (em). (can;

N a (2,5 -dianilinomethylenecyclopentylidene)diphenylaminium perchlorate (2.7 g., 1mol.), anhydro- 2 methyl 1 (3 sulfopropyl)naphtho[1,2 d]thiazolium hydrozide (3.4 g., 2 mols.+5%) and acetic anhydride (1 ml., 2 moIs.+10%) were warmed in mcresol (15 ml.) and then an excess of triethylamine (5.0 ml.) was added. The reaction was then heated under reflux for 2 min., cooled and acetic anhydride (50 ml.) was added. The mixture was then heated to reflux and the hot, suspension was filtered. The residue was extracted twice'with 100ml. portions of hot acetone and the yield of dye was 2.8 g. (56%), M.P. 231-232 'C., with decomposition. Thisdye showed (Table 1) maximum absorption in methanol at A830 m (the molecular absorption band). When dissolved in water at room temperature it showed a I-aggregate absorption maximum at A1070 mg with no suggestion of the molecular band showing.

6 EXAMPLE 4 Anhydro 3,3 di(2 carboxyethyl) 5,5' dichloro- 11 di phenylamino 10,12 ethylenethiatricarbocyanine hydroxide phenylaminium perchlorate (2.7 g., 1 mol.), 3-(2-carboxyethyl-5-chloro-2-methylbenzothiazolium iodide (4.0 g., 2 mo1s.+5%), acetic anhydride (1.0 ml., 2 moIs.+10%) were warmed in ethanol (15 ml.) and then triethylamine was added (4.0 ml., 4 mols.+50%). The mixture was heated under reflux for 10 min., cooled at room temperature for 5 min. and the crude dye collected on a filter. The crude product was extracted with hot methanol ml.) and dried. The crude dye was purified by stirring it inhot m-cresol, adding triethylamine to form solution,

filtering the hot solution, diluting the filtrate with hot methanol, and then adding acetic acid to precipitate the dye. The dye was then collected on a filter, extracted twice with hot methanol and the yield was 2.4 g. (63%),

M.P. 214215 C. with decomposition.

EXAMPLE 5 11 diphenylamino 10,12 ethylene 3,3 di(2 hy- [droxyethyl)thiatricarbocyanine perchlorate phenylaminium perchlorate (2.7 g., 1 mol.), 3-(2-hydroxyethyl)-2-methylbenzothiazolium bromide (2.8 g., 2 mols.+5% acetic anhydride (1.0-ml, 2 moIs.+10%),

and'triethylamine"('3.0 ml., 4 moIs.+10%) werereacted in ethanol in the same manner is Example 4. After one recrystallization from N,N-dimethylacetamide/methanol, the yield-0f purified dye was 1.6 g. (43%), M.P. 233'- 234 C. with decomposition.

EXAMPLE 6 11 diphenylamino 3,3 diethyl 10,12 ethyleneselenatricarbocyanine perchlorate H5 C C5115 1 cyclopentylidenediphenylaminium perchlorate (1.4

'g;, 1 mol.), 2-(Z-acetanilidovinyl)-3-ethylbenzoselenazolium iodide (5.5 g., 2 mols.+ex'cess) and triethylamine (1.5 ml., 2 mols.+excess) were dissolved in acetic anhydride 15 ml'.) and heated under reflux for 10 min. After cooling at room temperature for 5 min., the crude dye was collected on a filter, washed with methanol and EXAMPLE 7 3,3 diethyl 10,12 ethylene 11 (N methylanilino) oxatricarbocyanine perchlorate N aHi 1 cyclopentylidenemethylphenylaminium perchlorate (1.4 g., 1 mol.), 2-(2-acetanilidovinyl)-3ethylbenzoxazolium iodide (4.8 g., 2 mols.+l0%), and triethylamine (1.5 ml., 2 mols.+%) were dissolved in acetic anhydride ml.) and heated under reflux for 10min. After cooling at room temperature for 5 min., the crude product was collected on a filter, washed with methanol and dried. After one recrystallization from methanol, the yield of purified dye was 0.3 g. (10%), M.P. 251252 C. with decomposition.

EXAMPLE 8 Anhydro 3,3 di(2 carboxyethyl) 5,5 dichloro 10,12 ethylene 11 N methylanilinothiatricarbocyanine hydroxide tion and treating it with acetic acid to precipitate the dye as the free acid. The yield of purified dye was 0.6 g. (17%), M.P. 202-203 C. with decomposition.

EXAMPLE 9 5,5 dichloro 3,3 diethyl 10,12 ethylene 11 N methylanilinothiatricarbocyanine iodide 3 anilinomethylene 2 (N methylanilino) 1 phenyliminomethylcyclopentene (1.9 g., 1 mol.), 5 chloro-3-ethyl-2-methylbenzothiazolium iodide (3.7 g., 2 mols.+10%), acetic anhydride (0.5 ml., 1 mol.+10%), and triethylamine (2.1 ml., 2 mols.+%) were dissolved in ethanol (15 ml.) and heated under reflux for 5 min. The reaction mixture was filtered hot and the residue (crude dye) was washed with ethanol and dried. The

8 crude dye was initially purified by dissolving it in hot N,N-dimethylacetamide, filtering the solution, and then precipitating the dye by the addition of hot methanol. The dye was purified further by a recrystallization from methanolandthe yield was 0.9 g, (24%), M.P. 242243 with decomposition. v p

EXAMPLE 10 Anhydro 10,12 ethylene 11 methylanilino 3,3-

. ,di(3-- sulfopropyl)thiatricarbocyanine hydroxide Sodiurn salt 113C ClHs s I I 7 l s P Hail-0H: 93 U F Oa soy Na. s0.-'

1 cyclopentylidenemethylphenylaminium perchlorate (1.4 g., 1 mol.), anhydro-Z-(Z-anilinovinyl)-3-(3-sulfopropyl) benzothiazolium hydroxide, and an excess of triethylamine (4.0 ml.) were dissolved in acetic anhydride (20 ml.) andheated under reflux forlO min. After cooling, an acetone solution of sodium iodide (1.5 g.) was added and a sticky massfseparated. Additional acetone was added and the mixture was heated toa boilwith stirring. After chilling, the crude dye was collected on a filter and it was recrystallized by suspending it in hot methanol and then adding water to obtain solution. The yield of purified dye was 0.2 g. (5%), M.P. 245-246" C. with decomposition.

The following examples illustrate the preparation of the enamine and enaminium salt intermediates employed in the above Examples 1 to 10.

EXAMPLE 11 1-di(ethoxycarbonylmethyl) aminocyclopentene H: \CH H2C'(IJH2 EXAMPLE 12 1-cyclopentylidenediphenylaminium perchlorate Diphenylamine hydroperchlorate (27.0 1 mol.) and cyclopentanone (10.1 g., 1 mol.+10%) were stirred with ethanol (50 ml.) at room temperature. The product began to precipitate before complete solution took place and the mixture was heated to reflux. After cooling toroom temperature, the solid was collected on a filter, Washed with ethanol and dried. The yield of product was 28.2 g. (84%), M.P. 202-203 C. with decomposition.

9 EXAMPLE 13 N- 2,5-dianilinomethylenecyclopentylidene diphenylaminium Hs K /CaHs N 1-cyclopeutylidenediphenylaminium perchlorate (29.1 g., 1 mol.) and ethylisoformanilide (38.7 g., 2 mols. +50% were mixed thoroughly and heated in an oil bath at 140 C. for /2 hour. After cooling, the cake was crushed under methanol and the solid collected on a filter. The yield of product was 43 g. (91%), M.P. 180-181" C. with decomposition.

EXAMPLE 14 1-cyclopeutylidenemethylphenylaminium perchlorate I! o\ 0104- nio on,

N-methylaniline (11.6 g., 1 mol.+5% was dissolved in cyclopentanone (16.8 g., 1 mol.+100%) and 72% perchloric-acid (14.0 g., 1 mol.) was added in small por- 1- cyclopentylidenemethylphenylaminium perchlorate 27;4 g., 1 mol.) and "ethylisoformanilide (37.3 g., 2 mols.+%) were dissolved in N,N dimethylacetamide '(60 ml.) and heated under reflux for 3 min. The reaction was then allowed to stir until it reached room temperature. The mixture Was' then diluted with methanol and the solid collected on a filter. After extracting the solid with hot methanol, the yield of product was 26.0 g. (69%), M.P. 228229 C. with decomposition.

EXAMPLE 16 This example illustrates the absorption characteristics in methanol and in water solutions of a number of the tricarbocyanine dyes of the invention. The values obtained are listed in the following Table 1 as wavelengths of maximum absorption in methanol and as J-aggregates in water solutions.

TABLE 1.MAXIMUM ABSORPTIONA 1n Methanol In Aqueous Solution Solution (Molecular), (SI-Agg egates) Dye of Example No. w l

10 EXAMPLE 17 This example illustrates the sensitizing effects in photographic silver halide emulsions of a number of the tricarbocyanine dyes of the invention.

The dyes listed in Table 2 below were tested in a silver bromoiodide emulsion containing 0.77 mole percent iodide of the type described by Trivelli and Smith, Phot. Journal, 79, 330 (1939). The dyes, dissolved in suitable solvents, were added to separate portions of the emulsions at the concentrations indicated. The emulsions were then coated at a coverage of 432 mg. silver/ft. on a cellulose acetate film support. A sample of each coating was exposed on an Eastman IB Sensitometer and to a wedge spectrograph, processed for three minutes in a developer of the following composition:

Developer G. N-methyl-p-aminophenol sulfate 2.0 Sodium sulfite (anhydrous) 90.0 Hydroquinone 8.0 Sodium carbonate (monohydrate) 52.5 Potassium bromide 5.0 Water to make 1.0 liter.

and then fixed, washed and dried. The sensitizing values obtained are shown in the following Table 2.

TABLE 2.SENSI'IOMETRIG DATA Dye Concen- Sensitiztration (g./ ing Range mole Silver) (m Sensitization Maximum (mu) Emulsion Type In the preparation of photographic emulsions, the new dyes of the invention are advantageously incorporated in the washed, finished silver halide emulsion and should, of course, be uniformly distributed throughout the emulsion. The methods of incorporating dyes in emulsions are relatively simple and well known to those skilled in the art of emulsion making. For example, it is convenient to add the dyes from solutions in appropriate solvents, in which case the solvent selected should be completely free from any deleterious effect on the ultimate light-sensitive materials. Methanol, isopropanol, pyridine, etc., alone or in admixtures, have proven satisfactory as solvents for the majority of my new dyes. The type ofsilver halide emulsions'that can be sensitized, withthe new dyes include any of those'prepared with hydrophilic colloids that are known to be satisfactory for dispersing silver halides, for example, emulsions comprisingnatural materials such as gelatin, albumin, agar-agar, gum arabic, alginic acid, etc. and hydrophilic synthetic resins such as polyvinyl alcohol, polyvinyl pyrrolidone, cellulose ethers, partially hydrolyzed cellulose. acetate, and the like.

The concentration of'the new dyes in the emulsion can vary widely, i.e., from about 5 to about mgs. per liter of fiowable emulsion. The specific concentration will vary according to the type of light-sensitive material in the emulsion and according to the eifects desired. The suitable and most economical concentration for any given emulsion will be apparent to those skilled in the art upon making the tests and observations customarily used in the art of emulsion making.

To prepare a gelatino-silver halide emulsion sensitized with one of our new dyes, the following 'procedureis satisfactory: A quantity of the dye is dissolved in a suitable solvent and a volume of this solution containingfrom 5 to 100 mgs. of dye is slowly added to about 1000 cc. of a gelatino-silver halide emulsion. With most 'of our dyes, 10 to 20 mgs. of dye per liter of emulsion sufiice to produce the maximum sensitizing effect with the ordinary gelatino-silver halides including silver chloride, bromide, bromoiodide, chlorobromide, chlorobromoiodide, etc; emulsions. With fine-grain emulsions, which include most of the ordinary employed gelatino-silver chloride emulsions and the like, somewhat larger concentrations of dye may be necessary to secure optimum sensitizing eifect. While the preceding has dealt with emulsions comprising gelatin, it will be understood that these remarks apply generally to any emulsions wherein part or all of the gelatin is substituted by another suitable hydrophilic colloid such as mentioned above.

The above statements are only illustrative and are not to be understood as limiting our invention in any sense, as it will be apparent that our new dyes can be incorporated by other methods in many of the photographic silver halide emulsions customarily employed in the art. For instance, the dyes can be incorporated by bathing a plate or film upon which an emulsion has been coated, in the solution of the dye in an appropriate solvent. Bathing methods, however, are not to be preferred ordinarily.

Photographic silver halide emulsions, such as those listed above, containing the sensitizing dyes of our invention can also contain such addenda as chemical sensitizers, e.g., sulfur sensitizers (e.g., allyl thiocarbamide, thiourea, allylisothiocyanate, cystine, etc.), various gold compounds (e.g., potassium chloroaurate, auric trichlo- -ride, etc.) (see U.S. patents to W. D. Baldsiefen, 2,540,085,

granted Feb. 6, 1951; R. E. Damschroder, 2,597,856, granted May 27, 1952, and H. C. Yutzy et al., 2,597,915, granted May 27, 1952), various palladium compounds, such as palladium chloride (W. D. Baldsiefen, U.S. 2,540,086, granted Feb. 6, 1951), potassium chloropalladate (R. E. Stautfer et al., U.S. 2,598,079, granted May 27, 1952), etc., or mixture of such sensitizers; antifoggants, such as ammonium chloroplatinate (A. P. H. Trivelli et al., U.S. 2,566,245, granted Aug. 28, 1951), ammonium chloroplatinate (A. P. H. Trivelli et al., U.S. 2,566,263, granted Aug. 28, 1951), benzotriazole nitrobenzimidazole S-nitroindazole benzidine mercaptans etc. (see Mees, The Theory of the Photographic Process, Macmillan P-ub., 1942, p. 460), or mixtures thereof; hardeners, such as formaldehyde (A. Miller, U.S. 1,763,533, granted June 10, 1930), chrome alum (U.S. 1,763,533), glyoxal (I. Brunken U.S. 1,870,354, granted Aug. 9, 1932), dibromacrolein (0. Block et al., British 406,750, accepted Mar. 8, 1934), etc.; color couplers, such as those described in I. F. Salmineu et al., U.S. Patent 2,423,730, granted July 7, 1947, Spence and Carroll, U.S. Patent 2,640,776, issued June 2, 1953, etc.; or mixtures of such addenda. Dispersing agents for color couplers, such as those set forth in U.S. patents to E. E. Jelley et al., 2,322,027, granted June 15, 1943, and L. D. Mannes et al., 2,304,940, granted Dec. 15, 1942 can also be employed in the above-described emulsions.

Although the invention has been described in detail with particular reference to preferred embodiments thereof it will be understood that variations and modifications can be effected within the spirit and scope of the invention as described hereinabove and as defined in the appended claims:

We claim:

1. A photographic silver halide emulsion containing at least one tricarbocyanine dye compound having the general formula:

wherein n represents a positive integer of from 1 to 2,

R represents an alcohol radical, R and R each represents a member selected from the group consisting of an alkyl group, an lalkoxycarbonylalkyl group, and an aryl the group consisting of a hydrogen atom, an alkyl group of from 1 to 4 carbonatoms, 'a halogen atom and an. alkoxy group containing from 1 to 4 carbon atoms, X represents an acid anion, -m represents a positive integer of from 1 to 2 such that when m is 1 said R represents a member selected from the group consisting of a carboxyalkyl radical and a sulfoalkyl radical, and Z represents the nonmetallic atoms required to complete a 5- to 6- membered heterocyclic nucleus selected from the class consisting of a thiazole nucleus, a benzothiazole nucleus, a naphthothiazole nucleus, a thionaphtheno-7',6',4,5- thiazole nucleus, an oxazole nucleus, a benzoxazole nucleus, a naphthoxazole nucleus, a selenazole nucleus, 21 benzoselenazole nucleus, a naphthoselenazole nucleus,- 2. thiazoline nucleus, a Z-pyridine nucleus, at 4-pyridine nucleus, a 2-quinoline nucleus, a 4-quinoline nucleus, a lisoquinoline nucleus, a 3-isoquinoline nucleus, a 3,3-dialkylindolenine nucleus, an imidazole nucleus, a benzimidazole nucleus, and a naphthimidazole nucleus.

2. A photographic silver halide emulsion in accordance with claim 1 containing the dye compound 11-'di(ethoxycarbonylmethyl)amino 3,3 diethyl-lO,l2-ethylene-thiatricarbocyanine iodide.

3. A photographic silver halide emulsion in accordance with claim 1 containing the dye compound anhydro-lldiphenyl-amino 10,12 ethylene-3,3'-di(3-sulfopropyl)- 4,5; 4',5-dibenzothiatricarbocyanine hydroxide.

4. A photographic silver halide emulsion in accordance with claim 1 containing the dye compound anhydro-3,3'- di(2-carboxyethyl) 5,5 dichloro-ll-diphenylamino-IO, 1Z-ethyIene-thiatricarbocyanine hydroxide.

5. A photographic silver halide emulsion in accordance with claim 1 containing the dye compound 3,3'diethyl- 10,12-ethylene 11 (N-methylanilino)oxatrica-rbocyanine perchlorate. Y i

6. A photographic silver halide emulsion in accordance with claim 1 containing the dye compound anhydro-IO, 12-ethylene-ll-methylanilino 3,3 di(2-sulfopropyl) thiatricarbocyanine hydroxide, sodium salt.

7. A photographic element comprising a support having thereon at least one layer containing a photographic silver halide emulsion of claim 1.

8. A photographic element comprising a support having thereon at least one layer containing a photographic silver halide emulsion of claim 2'.

9. A photographic element comprising a support having thereon at least one layer containing a photographic silver halide emulsion of claim 3.

10. A photographic element comprising a support having thereon at least one layer containing a photographic silver halide emulsion of claim 4..

11. A photographic element comprising a support having thereon at least one layer containing a photographic silver halide emulsion of claim 5.

12. A photographic element comprising a support having thereon at least one layer containing a photographic silver halide emulsion of claim 6.

13. A photographic element comprising a'support having thereon at least one infrared absorbing filter layer consisting essentially of a hydrophilic colloid and at least one dye compound having the formula set forth in claim 14. A photographic element comprising a support hav- R (X")m-1 ing thereon at least one infrared absorbing filter layer consisting essentially of gelatin and the dye compoun of claim 2.

15. A photographic element comprising a support havgroup, R and R each represents a member selected from ing thereon at least one infrared absorbing filter layer 13 consisting essentially of gelatin and the dye compound of claim 1.

16. A photographic element comprising a support having thereon at least one infrared absorbing filter layer consisting essentially of gelatin and the dye compound of claim 3.

17. A photographic element comprising a support having thereon at least one infrared absorbing filter layer consisting essentially of gelatin and the dye compound of claim 4.

18. A photographic element comprising a support having thereon at least one infrared absorbing filter layer consisting essentially of gelatin and the dye compound of claim 5.

ing thereon at least one infrared absorbing filter layer consisting essentially of gelatin and the dye compound of claim 6.

References Cited UNITED STATES PATENTS 2,705,234 3/1955 Kendall et a1. 96106 2,735,770 2/ 1956 Brooker et al. 96106 2,955,939 10/1960 Brooker'et a1. 96-106 NORMAN G. TORCHIN, Primary Examiner MARY F. KELLEY, Assistant Examiner US. Cl. X.R.

19. A photographic element comprising a support hav- 15 96-106 I11Vcnt0t s A Fu i Jr- Donald W. Heseltine 81 Leslie G.S. Broc I: is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column lines 3-8,

CH -R mm: "x0. 3L+82978 Dated December 9, 1969 'invento -(s) Eumla, Jr, et al I: 1, certified that error appears in the above-identified patent arm that said Letters Patent are hereby corrected as shown below:

Cblximn 4, lines 23-28 R3 CH shouldread \JIL4LLJ COJLAQbiik/Di Page 3 3482973 Dated December 9, 1.969

Patent No.

I1ZVCZEOL'(S) Arthur Fumia Jr. et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 4, line 70 Exam le 1.

N(CH COOC H A 2 2 i I should read 1| I(c1-1 cooc H C\ /S =CH-CH=G/ \C-CH=CH I i H H I I 2 5 c -cu 0291 3 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 2

Dat d December 9, 1.969

Page 4 Inventor(s) Arthur Fumia, Jr. Donald W. Heseltine and Leslie G. S. Brooker It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

[- Column ll, line 64 R1\/R2 -Z- ..Z- 1' \1 R-N( -CH=CH) -C=CH-CH=(3Hf -cH=cH-(=c-H-cH) =1 R -cHcH-R should read 1. f2 I 1 w l I p l R-N -CH=CH) ml C=CH-CH=C|JH -CI-I=CH-C =CH-CH) =1 1+ i R 12 -011 H-R RIMIEDAND mom I, OCT 20 1970 ri "-51,, Athens L. Eamannmb fi A testing Offioar mm 33mm, 38. Oomiusiomr of Patents 

